Pump shaft seals

A pump shaft seal is a sealing which seals the rotating shaft were it passes through the non-rotating housing parts. The pump shaft seal allows the rotating shaft to enter the ‘wet’ area of the pump without leaking fluids.

Why do you need to seal your pump?

To understand the importance of pump seals, we first have to go back to some pumping basics. Fluids enter your pump through the suction nozzle at the center of a rotating impeller. As the impeller rotates, the vanes fill with fluid and are forced out of the pump housing through the discharge nozzle. Due to the discharge pressure, the fluid attempts to exit through the rotating shaft. This leads to fluid loss and a dangerous working environment. That’s why you need a sealing solution to minimize the leakage!

How pump shaft seals work

The (water) lubricated lip seals run over a partially grooved bush placed over the pump shaft. The helical shape of the grooves and peripheral velocity of the bush create water flow between the grooves and the lip seal.

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The Liquidyne® pump shaft seal

Predictable lifetime & environmentally friendly

The Liquidyne® pump shaft seal has a predictable lifetime due to the condition monitoring function. It’s also environmentally friendly due to the water lubricated system that saves energy through reduced friction.

Liquidyne pump shaft seals adding quality and reliability to your operation and has already been successfully installed at around 10.000 pumps. Lagersmit currently delivers Peace of Mind to a vast network of pump manufacturers, (petro)chemical and energy companies. Shell, Nouryon Industrial Chemicals (Formerly AkzoNobel), Stork and Sabic use the Liquidyne to their full satisfaction.

Liquidyne pump shaft seal

Compared to Gland packing and Mechanical seal

Pump shaft seal failure is one of the most common reasons for pump downtime. That’s why you want a reliable pump seal which ensures optimal operation hours and keeps going. In our blog we compared the Liquidyne to two types of pump seals: Gland packing and Mechanical seal.

Cooling-water pump


A number of years ago, SABIC and Lagersmit teamed up as part of a Global Framework Agreement. This collaboration started in 2004 with the successful installation of a Liquidyne® seal for a cooling-water pump from SABIC’s BUFA plant.

“Thanks to these achievements, we delivered on and surpassed our goal of providing “Peace of Mind” regarding our cooling-water pumps.”


More information


Eric de Paauw – Account Manager

Jan-Willem Bongers – Sales Manager

Eric de Paauw
Account manager